The Federal Trade Commission is mailing refund checks totaling nearly $20 million to more than 617,000 T-Mobile customers who had third-party charges added to their mobile bills. These refunds are the result of a 2014 settlement with T-Mobile, which also involved all 50 states and the District of Columbia, as well as the Federal Communications Commission.

As part of the settlement, T-Mobile agreed to fully refund unwanted third-party charges to its customers who applied for a refund. The company also agreed to remit to the FTC any remaining funds up to $90 million that were not distributed under the order. The FTC is using the remaining settlement money to send checks to customers who had third-party charges placed on their bills but did not participate in T-Mobile’s refund program.

The average check amount is $32. Recipients should deposit or cash checks within 60 days.